The greatest difference between Core i7 and Core i9 CPUs is their multi-threading performance. There are certainly some gains to be had in single-threaded performance with particular chips like the core I9 9900K. For example, Intel markets that processor as the most powerful gaming CPU in the world. While that may be true, we’re not sure the costs always outweigh the benefits.

With Intel’s latest, ninth-generation CPUs, the Core i7-9700K has the same eight cores as the 9900K, a frequency that almost matches it (and often can with a little overclocking) and has comparable performance in games and more limited-thread tasks. It’s the lack of hyperthreading which most separates them, giving the 9900K support for up to 16 threads at a time and noticeably improved multithreaded performance.

In conclusion, the core I9 is better then the core I7 in terms of its performance.